Arsenal face Benfica on Saturday and Monaco on Sunday in their home pre-season tournament, with Campbell set to be involved.

Despite impressing in the World Cup for Costa Rica, it is unclear whether Campbell will be given a first-team chance at Arsenal this season. He has spent the past three seasons on loan, at Lorient, Real Betis and Olympiacos, and Milan are interested in taking him to Italy for a fourth spell away from Arsenal.

Milan are expected to have scouts in the Emirates stands to watch Campbell, 22, who has insisted he is good enough to play in the Premier League.

Another player whose Arsenal future is in doubt is central defender Thomas Vermaelen, who is understood to have already agreed a deal in principle to join Manchester United.

Arsène Wenger, the Arsenal manager, admits Vermaelen could leave and that the club captaincy is likely to change hands.

“At the moment, Thomas Vermaelen is here, but he is injured with a short-term injury,” Wenger said. “It’s a possibility that he goes, if he goes we have to replace him because he’s an important player in our squad.

“If he goes, he cannot be captain. I haven’t solved that problem yet because I am not sure that he will stay. We’ll see.”

Asked whether he still has a decision to make over the captaincy if Vermaelen stays at Arsenal, Wenger added: “But I don’t have to make it today.”